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104 lines
2.2 KiB
C++
104 lines
2.2 KiB
C++
/*
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* stereodelay.cpp - defination of StereoDelay class.
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*
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* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
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*
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* This file is part of LMMS - http://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#include "stereodelay.h"
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#include <cstdlib>
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#include "lmms_basics.h"
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#include "interpolation.h"
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#include "lmms_math.h"
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StereoDelay::StereoDelay( int maxTime, int sampleRate )
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{
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m_buffer = 0;
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m_maxTime = maxTime;
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m_maxLength = maxTime * sampleRate;
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m_length = m_maxLength;
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m_index = 0;
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m_feedback = 0.0f;
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setSampleRate( sampleRate );
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}
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StereoDelay::~StereoDelay()
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{
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if( m_buffer )
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{
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delete m_buffer;
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}
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}
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void StereoDelay::tick( sampleFrame frame )
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{
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m_buffer[m_index][0] = frame[0];
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m_buffer[m_index][1] = frame[1];
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int readIndex = m_index - ( int )m_length - 1;
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if( readIndex < 0 )
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{
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readIndex += m_maxLength;
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}
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float fract = 1.0f - fraction( m_length );
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frame[0] = linearInterpolate( m_buffer[readIndex][0] ,
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m_buffer[( readIndex+1) % m_maxLength][0], fract );
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frame[1] = linearInterpolate( m_buffer[readIndex][1] ,
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m_buffer[( readIndex+1) % m_maxLength][1], fract );
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m_buffer[m_index][0] += frame[0] * m_feedback;
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m_buffer[m_index][1] += frame[1] * m_feedback;
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m_index = ( m_index + 1) % m_maxLength;
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}
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void StereoDelay::setSampleRate( int sampleRate )
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{
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if( m_buffer )
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{
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delete m_buffer;
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}
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int bufferSize = ( int )( sampleRate * m_maxTime );
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m_buffer = new sampleFrame[bufferSize];
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for( int i = 0 ; i < bufferSize ; i++)
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{
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m_buffer[i][0] = 0.0;
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m_buffer[i][1] = 0.0;
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}
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}
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